Selector-switch



H. F. DOBBIN.

SELECTOR SWITCH.

APPLICATION FILED JUNE 10, |916.V

1 ,205,520. Patented Nov. 21, 1916.

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H. F. DOBBIN.

SELECTOR SWITCH.

APPLICATION mED JUNE 1o. 1916.

1,205,520. i Patented Nov. 21, 1916.

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NT STATES PATEN OFFCE.

HENRY F. DOBBIN, O3? NEW YORK, N. Y., ASSIGNOR TO W'ESTERN ELECTRIC COMPANY, INCORPORATED, OF NEWT YORK, N. Y., .A 'CORPORATION OF NEVJ YORK.

SELECTOR-SWITCH.

Application led June 10, 1916.

T 0 all whom t may concern Be it known that I, HENRY F. DOBBIN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Selector- Switches, of which the following is a full, clear, concise, and exact description.

This invention relates to automatic switches for use in telephone systems, and more particularly to the type of switch in which a brush is first positioned in operative relation to a group of contacts and is then advanced to make connection with a desired contact in such group.

The object of the present invention is to provide a structure in which a terminal bank of the panel type may be used in con junction with one or more brush sets, such brush sets having both a vertical and a rotary motion, the vertical motion being applied irst. The general construction of a switch having means for providing motion as ab ve described, is shown in Patent No. 815,176 of Keith, Erickson and Erickson, issued March 13, 1906.

A feature of the invention is an arrangement by which a brush set is caused to travel over terminal sets in one group of t-he contact bank during one series of rotary steps, and a second brush set is caused to travel over terminal sets in a second group of the contact bank during the next series of steps.

An additional feature of the invention is the placing of all the tip terminals of the lines of a group in one division, while the ring terminals of the group are arranged in a second division, there being a separate brush for each division.

A structure having the above mentioned features has the advantages to be obtained from the use of the simpler and cheaper panel type contact bank, and at the saine time simplifies the construction of the brush shaft, since only two brush sets per shaft are needed, as against the five or ten brush sets needed per shaft in all previously known arrangements suitable for use with terminal contact banks of the panel type.

The preferred form of the switch shown in Figures 1 to 3 of the drawings is arranged for use in a two-wire multiple telephone system such as shown in an application of Charles L. Goodrum, Serial No. 35,326, filed June 21, 1915, and is therefore shown as Specification of Letters latent.

Patented Nov. 21, 1916.

Serial No. 102,900.

having only two contacts in each terminal set and only two brushes in each set. It is to be understood, however, that this switch may be provided with a greater number of terminals and brushes in each set if the switch is to be used in a threeor fourwire system.

rlhe invention may be better understood from the following description, reference being had to the accompanying drawings.

ln the drawings, Fig. 1 is a front elevation of a panel type terminal bank showing a brush carrying shaft in its normal relation to suoli bank; F ig. 2 is a plan view of the same, and shows tne angular relation of the brush sets on the shaft; F ig. 3 is a detail view in elevation showing the construction of the ternnnal bank.

Brush set-s 2-2 and 3 3 are riO'idly mounted on a shaft 1, which is arranged to be stepped in bot-h upward and rotary directions, the upward motion being applied first. The mechanism by which motion is given to the shaft 1 may be of any suitable character, the general construction of this type of operating mechanism being shown in the previously mentioned Patent No. 815,176.

The terminal bank is divided horizontally into four sections, the two lower sections containing the tip and rinO terminals of the first fifty lines of a group of one hundred, while the two upper sections contain -the tip and ring terminals of the remaining fty lines of the one hundred group. lThat is, sections l and 5 contain the multiple terminal sets of fifty lines and are arranged to be served by the lower brush set of a given brush-carrying shaft. The tip brush 3 of the set swings over tip terminals in section 5, while the ring brush 3l swings over ring terminals of corresponding lines in section l. rlhe brush set 2-2 and sections 6 and 7 have a similar relation.

As best shown in F ig. 2, the angular relation between the two brush sets is such that during the first live rotary steps the brush set 3-3 engages multiple terminal sets in the sections il and 5, and during the second five rotary steps the brush set 2 9 engages multiple terminal sets in sections G and 7.

Each section of terminals is divided into ten levels, each level containing a series of five terminals. The individual contacts 8 of each series are offset, as best seenin Fig. 3, so as to lie in the same plane. This method of offsetting the terminals is disclosed in an application by H. F. Dobbin, Serial No. 46,855, tiled August 23, 1915. The reason for locating the ring and tip terminals in different sections of a group is to allow the series of terminals to be more readily offset.

Between adjacent series of five terminal strips is interlaced a conductor strip, insulated from the multiple strips, which has a connection to ground for the purpose of eliminating crosstalk. This method for pre-V venting' crosstalk is described in an application by O. F. Forsberg, Serial No. 87,581, filed March 29, 1916.

As shown in Fig. Q, the contacts of the multiple strips may be so arranged that contacts are provided on both faces of the panel, in which case the bank would serve a series of line finder switches on one face, and a series of connector switches on the opposite face.

lVhat is claimed is:

1. In an automatic switch, a contact bank of the panel type, terminal sets therein divided into a plurality of groups, a brush shaft. a plurality of brush sets thereon, and means for actuating said brush shaft in a vertical direction and then in a rotary direc-V tion, the arrangement being such that one of said brush sets begins rotary travel over one of said groups of terminal sets at the time a preceding brush set completes its rotary travel over another one of said groups of terminal sets.

2. In an automatic switclna contact bank of the panel type, terminal sets therein divided into two groups, a brush shaft, two brush sets thereon, and means for actuating said brush shaft in a vertical direction and then in a rotary direction, the arrangement being such that the second of said brush sets begins rotary travel over the second of said groups of terminal sets at the time the first brush set completes its rotary travel over the first of said groups of terminal sets.

3. In an automatic switch for use in telephone exchange systems, a contact bank of the panel type, terminal sets therein divided into groups, the tip and ring terminals of said terminal sets being located in separate sections of a group, a brush shaft, a plurality of brush sets thereon, equal in number to the number of groups of terminal sets, and means for actuating said brush shaft in a vertical direction and then in a rotary direction to move said brush sets successively into engagement with successive groups of terminal sets.

l. In an automatic switch for use in telephone exchange systems, a contact bank of the panel type, terminal sets therein divided into two groups, the tip and ring terminals of said terminal sets being located in separate sections of a group, a brush shaft, two brush sets thereon, and means for actuating said brush shaft in a vertical direction and then in a rotary direction to move said brush sets successively into engagement with successive groups of terminal sets.

5 In an automatic switch for use in telephone exchange systems, a contact bank of the panel type, terminal sets therein divided into a plurality of groups, each of said groups being served by a brush set individual thereto, each of said groups comprising a plurality of series of terminal sets, the tip contacts of each series being offset so as to lie in the same plane, the ring contacts of each series being similarly offset, but lying in a different section of the group, a brush shaft carrying said brush sets, and means for moving said shaft vertically and then rotatably, each vertical step moving the brush sets to the successive levels of the series of terminal sets in the groups respectively served by said brush sets.v

6. In an automatic switch for use in telephone exchange systems, a contact bank of the panel type, terminal sets therein divided into two groups, each of said groups being served by a brush set individual thereto, each of said groups comprising ten series of terminal sets, the tip and ring contacts of each series being located in separate sections of the group, each series of five tip contacts 'being offset so as to lie in the same plane,

each series of ring contacts being similarly offset, a brush shaft carrying said brush sets, and means for moving said shaft vertically and then rotatably, each vertical step moving the brush sets to the successive levels of the series of terminal sets in the groups respectively served by said brush sets.

In witness whereof, I hereunto subscribe myk name this 8th day of June A. D., 1916.

HENRY r. DoBBiN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

` Washington, D. C. 

